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Bash Script Syntax Error Operand Expected


Religious supervisor wants to thank god in the acknowledgements Subtraction with a negative result How does Gandalf get informed of Bilbo's 111st birthday party? Seguin , Michal Papis [https://rvm.io/] This is on cloud9, so I don't know exactly what distro they are running but here is the output of cat /proc/version: Linux version 3.14-0.bpo.1-amd64 requirements code for ubuntu loaded Found required packages: bash, curl, patch, bzip2, ca-certificates, gawk, g++, gcc, make, libc6-dev, >patch, openssl, ca-certificates, libreadline6, libreadline6-dev, curl, zlib1g, zlib1g-dev, libssl-dev, >libyaml-dev, libsqlite3-dev, sqlite3, autoconf, The solution is not to put a backquote at the very end of the script, of course! this contact form

Using the shell's read builtin to parse these contents a whole line at a time would be considerably simpler and more readable. –Charles Duffy May 30 '14 at 19:34 1 If you'd like to contribute content, let us know. And this should read the numbers and it should divide them up. Ask Ubuntu works best with JavaScript enabled Unix & Linux Forums > Top Forums > UNIX for Dummies Questions & Answers Member Name Remember Me?

Bash Syntax Error Operand Expected (error Token Is )

Code: $ var= $ if (( $var >= (3 + 5) ));then echo true;else echo false;fi bash: ((: >= (3 + 5) : syntax error: operand expected (error token is ">= Last edited by crts; 08-14-2011 at 05:27 PM. Nominal Animal View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by Nominal Animal View Blog 08-14-2011, 08:31 PM #12 MTK358 LQ 5k Club share|improve this answer edited May 30 '14 at 20:44 answered May 30 '14 at 18:52 mklement0 44.5k8100105 The point is valid, but [[ ]] should also work with ksh

Browse other questions tagged bash unix or ask your own question. On THE other hand or on another hand? However, it is possible to do math with shell script. Syntax Error In Expression (error Token Is For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration.

Also, why sould it be set to ":"? Syntax Error Operand Expected (error Token Is = ) If not, why? bash has a amazing arithmetic expansion share|improve this answer edited Apr 9 '15 at 17:51 answered Apr 9 '15 at 16:25 Helio 2,69031640 I have updated the new script. Do COB LEDs usually need electrically insulating from the heatsink?

Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the Invalid Arithmetic Operator (error Token Is The variables only get updated if you call external commands. Dennis numbers 2.0 more hot questions question feed lang-sh about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts MTK358 View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by MTK358 View Blog 08-14-2011, 02:37 PM #4 makyo Member Registered: Aug 2006

Syntax Error Operand Expected (error Token Is = )

When taking passengers, what should I do to prepare them? The backslash preceding the ! Bash Syntax Error Operand Expected (error Token Is ) Reload to refresh your session. Bash Script Syntax Error Unexpected End Of File SYNOPSIS bc bc EXPRESSION Here are some examples: $ bc bc 1.06 Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.

I get the same error with ((l<=)). weblink To keep with script programming paradigm and allow for better math support, languages such Perl or Python would be better suited when math is desired. See below for details. Is this safe to display MySQL query error in webpage if something went wrong? Bash (error Token Is ")

After I manipulated LINES I issued commands like 'echo', ':' and 'cd'. Also, instead of k=$((k+1)) you can just write ((++k)) Done! My home country claims I am a dual national of another country, the country in question does not. navigate here If you need to reset your password, click here.

Instead of a while loop, why not a for loop? Expr: Syntax Error Code: # custom prompt function create-prompt-infobar { local i=0 if (($COLUMNS >= (${#PWD} + ${#?} + 11))); then echo -n "$PWD" for ((i=0; i<($COLUMNS-${#PWD}-${#?}-10); i++)); do echo ""; done echo -n Not the answer you're looking for?

Why do you use $(( )) instead of $[ ] like I was tought? –shoham Nov 24 '13 at 16:39 Well, either way is correct.

A single quote may not occur between single quotes, even when preceded by a backslash. I checked it; it works for me. –petrus4 Nov 26 '13 at 12:26 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using A double quote may be quoted within double quotes by preceding it with a backslash. Bash Check If Variable Is A Number asked 3 years ago viewed 11856 times active 3 years ago Related 2882Can a Bash script tell which directory it is stored in?728How can I redirect and append both stdout and

However, it is strange that it works now. But if you really want to make an array of those specific values, I recommend: input=(/tmp/dir{1..3}) Similarly, if your goal is just to loop through /tmp/dir1, /tmp/dir2, and /tmp/dir3 and perform Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. http://sovidi.com/syntax-error/bash-for-loop-syntax-error-operand-expected.php Why?

Output with the --debug flag: Warning! Good way to explain fundamental theorem of arithmetic? The Original EOF in backquote substitution Error As Florian Diesch says (and in Helio's answer also), the original problem was a missing ` at the end of the first backquoted expr With Bash and Korn shell, it is generally not needed.

A name for a well-informed person who is not believed? In this situation and many like it, the built-in ! The best solution I could find until now is to use 'tput' to get the size of the terminal. It's more readable and shortens the code.

Careful, though, if you export COLUMNS AND set the variables to a wrong value inside your script then 'tput' will also report wrong values. current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. Page 1 of 2 1 2 > Search this Thread 08-14-2011, 12:35 PM #1 MTK358 LQ 5k Club Registered: Sep 2009 Posts: 6,443 Blog Entries: 3 Rep: bash Use #!/bin/bash as the shebang instead.

expr¶ An old Unix program that can evaluate math is expr. watch out how your variable k is always incremented, and remember that the test part in the for loop (i.e., the l<=hitEnd[k] part) is evaluated at each pass! –gniourf_gniourf Dec 2 Perhaps you intended /tmp/dir1, /tmp/dir2, and /tmp/dir3 as opaque examples that may be replaced by anything. So here I see the same issue that MTK refers to but with a simpler test.

Already have an account? This kind of parameter expansion is called indirect expansion. Here is something similar: Code: #!/usr/bin/env bash echo " The value of variable BAD is \"$BAD\"" if (( $BAD <= 5 )) then echo " BAD is $BAD" fi echo BAD=4